RAC Node Does Not See Presented Disks
Last updated on JULY 03, 2018
Applies to:Oracle VM - Version 3.4.1 and later
Information in this document applies to any platform.
A disk was added to a VM using Oracle VM Manager, but the VM don't see that disk.
Dom0 show the new disk (/dev/mapper/360002ac0000000000000020f000055c0,xvdak), but the VM does not see them.
Running dmesg on the VM:
The system process "xenwatch" fail to allocate 6 continuous memory pages, and that's why it fail to attach the disks.
[578572.007045] xenwatch: page allocation failure: order:5, mode:0xc0d0 [578572.007055] CPU: 0 PID: 38 Comm: xenwatch Tainted: P OE 4.1.12-37.6.3.el6uek.x86_64 #2 [578572.007059] Hardware name: Xen HVM domU, BIOS 4.4.4OVM 09/06/2016 [578572.007063] 0000000000000005 ffff88062a14b7d8 ffffffff816bc5bc ffff88062a148000 [578572.007070] 000000000000c0d0 ffff88062a14b868 ffffffff81189e3a 0000000000000040 [578572.007076] ffff88062a01d400 ffff88062a14b818 ffffffff816bcf49 ffff88062a14b9a8 [578572.007081] Call Trace: [578572.007094]  dump_stack+0x48/0x5c [578572.007102]  warn_alloc_failed+0xea/0x140 [578572.007108]  ? preempt_schedule_common+0x29/0x50 [578572.007112]  ? _cond_resched+0x1d/0x30 [578572.007118]  __alloc_pages_slowpath+0x3f9/0x750 [578572.007125]  __alloc_pages_nodemask+0x28e/0x2b0 [578572.007133]  alloc_pages_current+0xaf/0x170
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